LonWorks Communication Bus Fundamentals
Network Guide
63
Figure 37: Maximum Number of VAVS Devices on a Daisy-Chain at Evenly Spaced Intervals
For non-VAV devices, determine the appropriate size transformer for the job as follows:
•
Add up the power requirements of all devices plus all external loads (see
on page 61). Multiply the total power needed by a multiplier of 1.3, as a security
margin. For example, to power five devices (15 VA each), the total load is 75 VA multiplied
by 1.3 is 98 VA. Choose a size of transformer just over this amount: For example, a 100
VA model.
•
When the total load of a number of devices requires a transformer with a rating greater
than 100 VA, use two or more transformers. Ensure that the load to be connected to each
transformer follows the guideline of Step 1 above.
Laboratory testing conditions for the above graph are as follows:
•
Distance between each VAV is evenly spaced along the entire wire length
•
Transformer specification: 100VA (120/24VAC)
•
Tested at room temperature with low voltage line conditions: 108VAC (50Hz)
Always use a separate transformer for each ECL-600 series controller and for each
of its associated I/O Extension Modules. One terminal on the secondary side of each
of these transformers must be connected to the building's ground and to the respec-
tive controller's or I/O Extension Modules' 24V COM terminal. See
Extension Module Power Supply Requirements
0
1
2
3
4
5
6
7
8
9
10
100
150
200
250
300
350
400
450
500
M
ax VAVS in D
ai
sy
‐C
h
ai
n
Total Wire Length
Daisy Chain Performance
VAVS + SmartVue (AWG18)
VAVS + SmartVue (AWG16)
VAVS + Sm 2DO (1,6VA each) (AWG18)
VAVS + Sm 2DO (1,6VA each) (AWG16)
VAVS + Sm SmartVue CO2 + 2DO (1,6VA each) (AWG18)
VAVS + Sm SmartVue CO2 + 2DO (1,6VA each) (AWG16)
(30)
(45)
(60)
(75)
(90)
(105)
(120)
(135)
(150)
Feet
(meters)
Содержание ECB-VAV
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